The manufacturers of a 35-metre turbine that collapsed near Holsworthy are investigating 20 other turbines of the same model across the country.
Endurance Wind Power, who made the turbine at East Ash Farm, in Bradworthy, has confirmed through their initial investigations that the collapse was not due to a fault in the tower or turbine itself.
The Endurance E-3120 turbine, which was the first of the model to be installed in the country under three years ago, collapsed in the early hours of January 27.
The incident was followed by the collapse of a second turbine in North Cornwall at Winsdon Farm in North Petherwin four days later on Wednesday last week.
No one has been injured in either incident.
In a statement released on Endurance's website they said: "We are working cooperatively with the dealer that installed the turbine and the engineering firm that designed and supplied its foundation to understand the precise cause of the problem.
"Endurance Wind Power has more than 300 turbines installed in the UK.
"As a precautionary measure, approximately 20 installations that occurred during the same time period are also being inspected. Communication with dealers and customers has been often, fluid, and transparent since the incident occurred.
"We appreciate and understand the public interest in this story but the investigation will take time and, as such, it is premature to speculate on an exact root cause until the investigation is concluded. In the meantime, should you have any questions or concerns, please email them to email@example.com"
As well as Endurance's investigation, the installers of the turbine Dulas Ltd and the Health and Safety Executive are also investigating the collapse.